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-rw-r--r--libdimension/dimension/array.h107
-rw-r--r--libdimension/dimension/canvas.h25
-rw-r--r--libdimension/dimension/geometry.h23
3 files changed, 137 insertions, 18 deletions
diff --git a/libdimension/dimension/array.h b/libdimension/dimension/array.h
index 036d6c8..5ce6fc3 100644
--- a/libdimension/dimension/array.h
+++ b/libdimension/dimension/array.h
@@ -20,14 +20,16 @@
/*
* Simple thread-safe generalized arrays, for returning variable-length arrays
- * from functions, and other fun stuff.
+ * from functions, and other fun stuff. All functions are inline for
+ * performance reasons.
*/
#ifndef DIMENSION_ARRAY_H
#define DIMENSION_ARRAY_H
#include <pthread.h> /* For pthread_rwlock_t */
-#include <stdlib.h> /* For size_t */
+#include <stdlib.h> /* For size_t, malloc */
+#include <string.h> /* For memcpy */
typedef struct {
void *ptr;
@@ -36,22 +38,105 @@ typedef struct {
/* Array allocation never returns NULL - if dmnsn_new_array returns, it
succeeded */
-dmnsn_array *dmnsn_new_array(size_t obj_size);
-void dmnsn_delete_array(dmnsn_array *array);
+DMNSN_INLINE dmnsn_array *
+dmnsn_new_array(size_t obj_size)
+{
+ dmnsn_array *array = (dmnsn_array *)malloc(sizeof(dmnsn_array));
+ if (array) {
+ array->obj_size = obj_size;
+ array->length = 0;
+ array->capacity = 4; /* Start with capacity of 4 */
+
+ /* Allocate the memory */
+ array->ptr = malloc(array->capacity*array->obj_size);
+ if (!array->ptr) {
+ dmnsn_error(DMNSN_SEVERITY_HIGH, "Array allocation failed.");
+ }
+ }
+
+ return array;
+}
-void dmnsn_array_push(dmnsn_array *array, const void *obj);
-void dmnsn_array_pop(dmnsn_array *array, void *obj);
-void dmnsn_array_get(const dmnsn_array *array, size_t i, void *obj);
-void dmnsn_array_set(dmnsn_array *array, size_t i, const void *obj);
-void *dmnsn_array_at(dmnsn_array *array, size_t i);
+/* Delete the array */
+DMNSN_INLINE void
+dmnsn_delete_array(dmnsn_array *array) {
+ if (array) {
+ free(array->ptr);
+ free(array);
+ }
+}
-/* Inline so for-loops calling this are fast */
+/* Get the size of the array */
DMNSN_INLINE size_t
dmnsn_array_size(const dmnsn_array *array)
{
return array->length;
}
-void dmnsn_array_resize(dmnsn_array *array, size_t length);
+/* Set the size of the array */
+DMNSN_INLINE void
+dmnsn_array_resize(dmnsn_array *array, size_t length)
+{
+ if (length > array->capacity) {
+ /* Resize if we don't have enough capacity */
+ array->capacity = length*2; /* We are greedy */
+ array->ptr = realloc(array->ptr, array->obj_size*array->capacity);
+ if (!array->ptr) {
+ dmnsn_error(DMNSN_SEVERITY_HIGH, "Resizing array failed.");
+ }
+ }
+
+ array->length = length;
+}
+
+/* Get the i'th object, bailing out if i is out of range */
+DMNSN_INLINE void
+dmnsn_array_get(const dmnsn_array *array, size_t i, void *obj)
+{
+ if (i >= dmnsn_array_size(array)) {
+ /* Range check failed */
+ dmnsn_error(DMNSN_SEVERITY_HIGH, "Array index out of bounds.");
+ }
+ memcpy(obj, (char *)array->ptr + array->obj_size*i, array->obj_size);
+}
+
+
+/* Set the i'th object, expanding the array if necessary */
+DMNSN_INLINE void
+dmnsn_array_set(dmnsn_array *array, size_t i, const void *obj)
+{
+ if (i >= dmnsn_array_size(array)) {
+ /* Resize if i is out of range */
+ dmnsn_array_resize(array, i + 1);
+ }
+ memcpy((char *)array->ptr + array->obj_size*i, obj, array->obj_size);
+}
+
+/* Element access */
+DMNSN_INLINE void *
+dmnsn_array_at(dmnsn_array *array, size_t i)
+{
+ if (i >= dmnsn_array_size(array)) {
+ /* Resize if i is out of range */
+ dmnsn_array_resize(array, i + 1);
+ }
+ return (char *)array->ptr + array->obj_size*i;
+}
+
+/* Push obj to the end of the array */
+DMNSN_INLINE void
+dmnsn_array_push(dmnsn_array *array, const void *obj)
+{
+ dmnsn_array_set(array, dmnsn_array_size(array), obj);
+}
+
+/* Pop obj from the end of the array */
+DMNSN_INLINE void
+dmnsn_array_pop(dmnsn_array *array, void *obj)
+{
+ size_t size = dmnsn_array_size(array);
+ dmnsn_array_get(array, size - 1, obj); /* Copy the object */
+ dmnsn_array_resize(array, size - 1); /* Shrink the array */
+}
#endif /* DIMENSION_ARRAY_H */
diff --git a/libdimension/dimension/canvas.h b/libdimension/dimension/canvas.h
index 269763b..4c94c33 100644
--- a/libdimension/dimension/canvas.h
+++ b/libdimension/dimension/canvas.h
@@ -41,11 +41,24 @@ dmnsn_canvas *dmnsn_new_canvas(unsigned int x, unsigned int y);
void dmnsn_delete_canvas(dmnsn_canvas *canvas);
/* Pixel accessors */
-dmnsn_color dmnsn_get_pixel(const dmnsn_canvas *canvas,
- unsigned int x, unsigned int y);
-void dmnsn_set_pixel(dmnsn_canvas *canvas,
- unsigned int x, unsigned int y, dmnsn_color color);
-dmnsn_color *dmnsn_pixel_at(dmnsn_canvas *canvas,
- unsigned int x, unsigned int y);
+
+DMNSN_INLINE dmnsn_color
+dmnsn_get_pixel(const dmnsn_canvas *canvas, unsigned int x, unsigned int y)
+{
+ return canvas->pixels[y*canvas->x + x];
+}
+
+DMNSN_INLINE void
+dmnsn_set_pixel(dmnsn_canvas *canvas,
+ unsigned int x, unsigned int y, dmnsn_color color)
+{
+ canvas->pixels[y*canvas->x + x] = color;
+}
+
+DMNSN_INLINE dmnsn_color *
+dmnsn_pixel_at(dmnsn_canvas *canvas, unsigned int x, unsigned int y)
+{
+ return canvas->pixels + y*canvas->x + x;
+}
#endif /* DIMENSION_CANVAS_H */
diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h
index 2f08012..9e1aec0 100644
--- a/libdimension/dimension/geometry.h
+++ b/libdimension/dimension/geometry.h
@@ -79,6 +79,7 @@ dmnsn_line_construct(dmnsn_vector x0, dmnsn_vector n)
DMNSN_INLINE dmnsn_vector
dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs)
{
+ /* 3 additions */
dmnsn_vector v = { lhs.x + rhs.x, lhs.y + rhs.y, lhs.z + rhs.z };
return v;
}
@@ -86,6 +87,7 @@ dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs)
DMNSN_INLINE dmnsn_vector
dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs)
{
+ /* 3 additions */
dmnsn_vector v = { lhs.x - rhs.x, lhs.y - rhs.y, lhs.z - rhs.z };
return v;
}
@@ -93,6 +95,7 @@ dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs)
DMNSN_INLINE dmnsn_vector
dmnsn_vector_mul(double lhs, dmnsn_vector rhs)
{
+ /* 3 multiplications */
dmnsn_vector v = { lhs*rhs.x, lhs*rhs.y, lhs*rhs.z };
return v;
}
@@ -100,6 +103,7 @@ dmnsn_vector_mul(double lhs, dmnsn_vector rhs)
DMNSN_INLINE dmnsn_vector
dmnsn_vector_div(dmnsn_vector lhs, double rhs)
{
+ /* 3 divisions */
dmnsn_vector v = { lhs.x/rhs, lhs.y/rhs, lhs.z/rhs };
return v;
}
@@ -107,12 +111,14 @@ dmnsn_vector_div(dmnsn_vector lhs, double rhs)
DMNSN_INLINE double
dmnsn_vector_dot(dmnsn_vector lhs, dmnsn_vector rhs)
{
+ /* 3 multiplications, 2 additions */
return lhs.x*rhs.x + lhs.y*rhs.y + lhs.z*rhs.z;
}
DMNSN_INLINE dmnsn_vector
dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs)
{
+ /* 6 multiplications, 3 additions */
dmnsn_vector v = { lhs.y*rhs.z - lhs.z*rhs.y,
lhs.z*rhs.x - lhs.x*rhs.z,
lhs.x*rhs.y - lhs.y*rhs.x };
@@ -122,19 +128,34 @@ dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs)
DMNSN_INLINE double
dmnsn_vector_norm(dmnsn_vector n)
{
+ /* 1 sqrt, 3 multiplications, 2 additions */
return sqrt(dmnsn_vector_dot(n, n));
}
DMNSN_INLINE dmnsn_vector
dmnsn_vector_normalize(dmnsn_vector n)
{
+ /* 1 sqrt, 3 divisions, 3 multiplications, 2 additions */
return dmnsn_vector_div(n, dmnsn_vector_norm(n));
}
dmnsn_matrix dmnsn_matrix_inverse(dmnsn_matrix A);
dmnsn_matrix dmnsn_matrix_mul(dmnsn_matrix lhs, dmnsn_matrix rhs);
dmnsn_vector dmnsn_matrix_vector_mul(dmnsn_matrix lhs, dmnsn_vector rhs);
-dmnsn_line dmnsn_matrix_line_mul(dmnsn_matrix lhs, dmnsn_line rhs);
+
+/* Affine line transformation; n = lhs*(x0 + n) - lhs*x0, x0 *= lhs */
+DMNSN_INLINE dmnsn_line
+dmnsn_matrix_line_mul(dmnsn_matrix lhs, dmnsn_line rhs)
+{
+ /* 24 multiplications, 6 divisions, 30 additions */
+ dmnsn_line l;
+ l.x0 = dmnsn_matrix_vector_mul(lhs, rhs.x0);
+ l.n = dmnsn_vector_sub(
+ dmnsn_matrix_vector_mul(lhs, dmnsn_vector_add(rhs.x0, rhs.n)),
+ l.x0
+ );
+ return l;
+}
/* A point on a line, defined by x0 + t*n */
DMNSN_INLINE dmnsn_vector
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 16:23:31 +0000